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Multiple Impacts of the Aluminum Oxide Passivation Layer on the Properties OF Cu(In,Ga)Se2 Solar Cells
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Multiple Impacts of the Aluminum Oxide Passivation Layer on the Properties OF Cu(In,Ga)Se2 Solar Cells
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Journal Article
Multiple Impacts of the Aluminum Oxide Passivation Layer on the Properties OF Cu(In,Ga)Se2 Solar Cells
2024
Overview
In this study, the origins of efficiency gains in Cu(In,Ga)Se2 (CIGS) solar cells are investigated by introducing an Al2O3 passivation layer in terms of the oxidation condition of Mo back contact, alkali‐metal diffusion, minority carrier lifetimes (τ), and charge conditions. The study reveals that introduction of an Al2O3 back‐contact passivation layer into solar cells yields multiple impacts. Al2O3 deposition enhances the oxidation of the Mo back contacts, increasing Na solubility in Mo and Na diffusion from Mo into the CIGS layer, thereby modifying the metastable properties of CIGS. The charge condition at the CIGS/Al2O3 interface is not fixed negative charge but variable, dependent on whether electrons or holes are supplied. During solar cell operation, the interfacial charge condition is expected to be neutral or positive for Al2O3 grown using plasma or thermal atomic layer deposition techniques, respectively. Moreover, the mechanical peeling off of CIGS from Mo back contact enhanced τ in a similar way as with the insertion of Al2O3. Based on this study, the enhancement of alkali metal supply and the removal of direct contact of CIGS to the metal contact (Mo) can play crucial roles in improving the performance of CIGS solar cell. Introduction of Al2O3 passivation layer into Cu(In,Ga)Se2 (CIGS) solar cell improves device performance by making multiple impacts. Oxidation of the Mo back contacts increase Na solubility in the Mo and accordingly enhanced Na diffusion from the Mo into CIGS layer, resulting in modified bulk property of CIGS. Also, the removal of direct contact to metal contact (Mo) reduces back‐contact recombination.
Publisher
John Wiley & Sons, Inc,Wiley-VCH
Subject
